Somebody write rules of addition, subtraction, division, multiplication of common fractions in the 5th class. The rule is desirable.

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To put or subtract a common fraction it is necessary to reduce fractions to a common denominator, and then to subtract or put numerator, and to leave a denominator to the same. To increase fraction it is necessary to increase greatly numerators separately and denominators the same to pereumnozhit among themselves the received answers to write down in fraction. To divide fractions it is necessary to increase numerator of the first fraction with a denominator of the second fraction, and to pereumnozhit the second numerator with a znamenamenatel of the first fraction the answer to write down in the form of fraction
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Answer add